Rock-boring machine



Aug. 1, 1933. LQHAMMER ROCK BORING MACHINE 1951. 6 Sheets-Sheet 3 Filed March 31 Ill/111,

Au 1, 1933. y L. HAMMER 1,920,904

ROCK BORING MACHINE Filed March :51, 1931 6 Sheets-Sheet 4 4 1% www w Dz. Wammfr Aug. 1, 1933 HAMMER ROCK BORING MACHINE Filed March 31, 1951 6 Sheets-Sheet 5' Aug. 1, 1933. L. HAMMER ROCK BORING MACHINE Filed March 31, 1931 6 Sheets-Sheet 6 Patented Aug. 1, 1933 iszosci ROCK-BGRING MACHINE Ludwig. Hammer, Vienna, Austria Application March'31, 1931, Serial No. 526,690, and in Austria March 25, 1930 22 Claims.

the boring machine, the section being taken I on the broken line 3 3 of Fig.2. Fig. 4 shows the top end of the boring machine turned through an engle of 90 degrees with respect to the view shown in Fig. 2. Fig. 5 shows the feed mechanism of the boring machine in part-sectional elevation. Figs. 6 and 7 are sections taken on lines 6-43 and 7-7 of Fig. 2 respectively. Fig. S'shows in longitudinal section the lining device of the boring machine. Fig. 9 shows in cross section the lining device, the section being taken onthe broken line 9-9 of Fig. r 8. Fig. 10 is a diagrammatic sectional view, the

section being taken on line 10-10 of Fig. 8. Fig. 11 shows in side View a modified construction of the machinefor boring tunnels. Fig. 12 is a vfront view and Fig. 13 a plan'view, partly in section, of the arrangement shown in Fig. 11. Fig. 1 1 is a modified construction of the arrangement for varying the length as shown in Figs. 11 and, 12. Fig, 15 illustrates diagrammatically the operation or" the device shown in Figs. 11, 12 r and 13. Fig. 16 is a part-sectional view of a modified construction of the boring machine. Fig. 17 is a view of the machine shown in Fig. 16 turnedthrough an angleof 90 degrees.

In the same way as in the chisel machines of known construction, chisels 3 are arranged between levers 2 'mounted on a shaft 1, said chisels being driven by motors 4 and rotate in a plane at a right angle to the shaft 1. Also levers arranged in the form of a 'star or a single or double discmay be arranged in place of a single pair of levers or of a single lever with freely movable shaft 1 or chisel-pins of this kind, in order to operate a larger number of pairs'of chisels.

The chisel-shaft l is mounted in a forked 0 member 5, which forms an extension of the tubula'r shaft 6, the latter being mounted in an annular bearing member 8, provided with a supporting bearing 32 and a bearing drum 7. The outer face of the bearing ringS, supporting the rotary system or its bearings '7 and 32, is pro vided with at least three guides rollers 10, which are forced outward by springs 9 and if desired are adjustable and are disposed not in one plane as shown but in two planes which are disposed apart as far as possible, in order .to positively secure an axial parallel guiding.

Further in order to effect a strong clamping action between the bearing and closure ring 8, the same is provided (in the drawings indicated by the cylinders 53 only) with clamping devices of like construction, as it is the case in connection with all other supporting rings 35, 47. Apressure scavenging pipe 11 is arranged at both sides of the plane of rotation of the chisels and at the opposite side is disposed a suction scavenging pipe 12, the enlarged mouth of the same closely rests against the boring face 13 at both sides of the place of operation of the chisels. i

The fork-rotation may be derived, for instance,

- by a separate motor 14 as shown in Figs. 1 and 2 which, by way of suitable transmission members for instance worms and toothed wheel 15 to 19, operates a toothed Wheel 20 fixed to the head 21 of the hollow shaft 6.

Preferably a distributing drum 21 for the distribution of the pipes and the supply of current is mounted on the forked support 5 and on the hollow shaft 6 and also may serve as carrier of the toothed wheel 20 and the brush 22 from which the current, supplied by way of the cable 23, passes to the connection cable 24 of the mo-' tors (see Fig. 2).

In the interior of the drum 21, the scavenging pipe 11 terminates in a cup-shaped and double-walled enlargement 25 and the pressure pipe 26 at the top extends into the inner wall of the cup-shaped enlargement. A pressure pipe 27 with its top end packed passes from the pump 28 into the pressure pipe 26, while the suction pipe 29 of the pump passes into the water-compartment 3!) of the collector 31.

' The hollow spaces between the pipes and the tubular shaft 6 within the bearing drum 7 and the distributing drum 21 act as collector for the lubricating oil of the boring machine.

In order to provide for a better guidance, the rotary boring system and the pressure and suction pipe preferably rest on suitable parts, with the exception of the bearing 7, this being diagrammatically indicated in Fig. 2 by Way of the supporting rings 32, of the bearing ring 8. In order to follow the progress of boring, the bearing ring 8 is suspended from two double-racks 33 by means of a double-gear comprising two 1 toothed wheels 33', said racks being secured to a supporting frame, the feed ring 35, and secured in the drilled hole for instance by clamping eccentrics 34 (Figs. 1, 2, and 3.)

The feed-gear of the boring machine is mounted at both sides of the shaft on a frame 36, fixed to the bearingrdrum 7, and each consists for instance of a pair of worm-wheels 3'7 with looking wheels 38 and of toothed wheels 39, which are mounted on their shafts, mesh with the racks 33 and constitute the actual supporting members of the bore-mechanism, The feed-gear is operated for instance by a worm 40, operated by the worm-wheel 18 which is driven by the motor 14. The bottom end of the racks is enlarged to form a rest 41 for the toothed wheelsZQ. Whenever the drilling system has descended to such an extent, that the toothed wheels 39 practically bear on the seat 41, the top extension 42 of a control rod 43,.wl1ich is secured to theframe 36, strikes against a pawl 44, for the purpose hereinafter referred to and which is retained in one of its extreme" positions by a spring (not; shown) and which, by reversing the presssure oil coming from one tank 450:, also move in such a manner the eccentrics 34 of'the feed ring 35, operated for instance by hydraulic pistons in the cylinders 53, and the eccentrics (not shown in the drawings) of the'bottom bearing-ring 8, which serve for the same object, that the bottom ring 8 carrying the drilling system is retained in the bore-hole, while the top ring 35- now follows the direction of operation of the locking means 38 and can descend. until the second projection 46, of the rod 43 again pushes the pawl44 into the opposite position, whereby they bottom ring 8 isreleased again, while the top ring is clamped again and now the drilling operation starts anew.

The drill-swarf, fed upward. bythe. injector 25',is collected in a swarf-vessel 31, whichis located above the drilling mechanism on a. third supporting: frame, the supporting ring 410i the swarf'. vessel, by a hydraulic, pneumatic or electromagnetic clamping device which is shown in the. drawings byway of cylinders 53 and eccentries. 48. This swarf-vcssel or its carrier, the supporting frame 47,. isv fed in accordance with the progress of drilling in the same way as the.

supporting. frame 35, this being efiectedfor instance by a second control rod 49 with projections 50 and 51,. which disengages the control mechanism 52 operating the eccentrics 43.

The swarf-vessel. 31 is provided inflitsmiddle with a pipe 54. for the passage of the slowly rotating suction pipe 6. The top end of this suction pipe 6 is bell-shaped at 55,. in order to lead the drilling-swarf of the scavenging water into the vessel 31-. In. order 'that the scavenging water. may be used again, the vessel 31 is provided with a screen 56, which allows the passage of the water into the outer compartment 30 of the swarf-vessel, from where it passes byway ofthe suction pipe 29 again intov the scavenging circuit, while the drilling-swarf is collected in the screen, Figs. 2 and. 6. Besides the central bore-passage- 54, the eccentrically arranged smaller passage. 57 is led through the swarfvessel and serves for the receptionof an'electric currentcable 23, which by way of the suspension bracket 59 passes into the; rope-head 60 and from here, together with the wire rope 62, above the ground.

. The swarf-vessel 31 and its contents are of considerable weight and therefore dampening means are provided for the stepwise feed at a moderate speed. This device may consist for instance of one or more double-walled hydraulic cylinders (63a and 63b). The bottom of the inner cylinder is provided with a larger bore, which is closed by a valve 64' with small ho1e'64a. The piston 65, arranged in the inner cylinder, is fixed by means of its piston-rod to the upper supporting frame 4'7 of the swarfvessel. If the supporting frame 35 descends, the liquid passes out of the compartment, formed between the two cylinders, through the opening in the floor and follows with moderate resistance the piston 65 moving up in the inner cylinder and thus causes a sufficient dampening of the progressing frame 35, which carries the bore-machine. At the end of this movement, the piston 65 is disposed at the top end of the cylinder 63a. Now if by securing the supporting frame 35 and disengaging the supporting frame 4'7, this frame and its load descend, the valve 64 is closed and, in View of the pressure of the loaded piston 65, the liquid slowly passes into the outer cylinder by way of its narrow bore and provides for a gradual descent of the heavy swarf-vessel.

At its top edge, the inner cylinder 63b is provided with holes 64 through which returns into the outer oil-compartment any oil which may have passed out in view of an untightness of the piston 65.

The swarf-vessel 31 is open at the top and carries on a transverse bar the pump 28 with the pipe. 27 leading to the pressure piping and is closed by an arched cap 66, which is tapered upwardly and encloses the said parts with sufficient play for the axial. movement of the suc tion pipe bell 55, the said cap guiding the suction part 860i the swarf-feed device into the free opening ,ofthe swarf-vessel. 31, Fig. 5. The pump 28 is constructed preferably inthe form of a circulating pump.

The supporting rings 8, 35 and 47, clamped to the bore-hole wall, are shown in thedrawings} for the sake of simplicity, with clamping devices arranged in one plane-only. However alsotwo or more rows of such clamping devices may be provided, according to the strength of the drilled layer and of the weight to be carried by the supporting rings.

in view of the transverse movement of the rotating system of chisels it is of advantage to dispose the cutting edges of .the chisels at an incline with respect to the transverse movement, so that also a lateral movement of the chisels ispossible by the secondary movement, e.g. at a right angle with respect to the rotation of the chisels, whereby a lateral displacement of the chisels is rendered impossible.

Separate vessels or hollow spaces already present may be used as lubricating oil tanks, such as for instance the bearing-drum '7 and of the forked head 21a (Fig. 2), while the hollow arms 5 are usedas means for feeding the lubricating oil to the motors '4 of the 'chisel machine. the used lubricating oil is collected in'chambers 21?), mounted on the motor-hoods (Fig. 2).

The bore-machine is moved above ground only in case it is necessary to replace blunt chisels, and therefore it is of advantage to use a larger number of chisels.

The weight of the swarf-vessel' 31, its supporting ring and the other parts are partly necessary for the stepwise feed of these parts. While the weight of the rope 62 is fully balanced above ground in order to safeguard the stepwise feed,

device only which is'not necessary forthe feed operation. 2 g An essential feature of the present boring process resides in the method of feeding the swarf which is characterized on the one hand by the accumulation of the swarf of a larger bore-length in a swarf-vessel 31 connected with the drilling machine, and on the other hand by emptying from time to time this vesseLwhich is permanently disposed in the bore-hole,-by means of a separate swarf-feed device.

As shown in Fig. 5; this swarf -feed device consists of an outer sheet metal cover 67 and if desired of an inner filter-tank 68 with the central tubular passage 69 for the passageof the supporting cable 62 of the bore-machine and of a gripping device, which is operative whenever the disk '70 rests on the disk 61 of the'rope-head and which for instance consists of scissorlike members'iz pulled together by springs 71 and of rollers 73 or is constructed according to the frames 35 and 47. v

The part of the outer feed tank 67, disposed outside the filtentank 68, carries a scavenging water tank 83 which at its lowest part is provided with a valve '74 for discharge into the swarfvessel 31, said valve being operated for instance by an electric arrangement '75. The swarf 76 is sucked out of the swarf-vessel 31 by means of a. double pump '77, a pipe 78, an attached tube '79 and a suction basket 80 into which passes a second smaller tube 81, supplying by way of the same pump 77 and the long pipe 82 the pressure water from the scavenging water tank 83 of the feed-tank 67, in order to loosen the swarf' '76 (Fig. 2) and thus render it suitable for feeding. The fed, mixture of swarf and water passes through the discharge pipe 84 of the pump 77 into the filter-tank 68, where it accumulates at 85 on the floorof the latter, while the scavenging water drips through the filter in the outer tank 67 and replaces the water sucked away by the pump '77 and pipe 82. However the swarf accumulated in the -swarf-vessel 31 may be simply exchanged in a swarf-feed vessel without filter against a fresh scavenging water provided in a separate chamber.

The swarf-feed device is lifted by a double rope 86, which also may serve for supplying current to the motors of the feed-tank and for this object is electrically insulated and fixed to a bracket 67c.

The swarf 85 can be removed from thelifted feed-tank 67, 68 either by a device arranged above ground and similar to the system of pumps and pipings 7'7, 78, 79, '80, 81, 82,8l, or'

by a pipe 87 which is arranged at the-floor of the filter 68 and provided with a valve'88, which can be lifted for instance by an electrically op- A pipe 90 for the overflow of scavenging water, which erated device 89 in well known manner.

preferably can be adjusted according to the usual'assumption of scavenging water, prevents the feed-tank from being overcharged with scavenging water.

The bore-holes, produced according to the present process, are of such a diameter that their lining with iron pipes would be too expensive. Therefore as a necessary completion of this process of boring, a new method of lining the well is included and diagrammatically illustrated in Figs. 8, 9 and 10. 1

'As shown in Figs. 1, 2, 3 and 5, all parts of the bore-machine and of the swarf-feed are of dividual supporting-frames may, on lifting the whole machine, be withdrawn into the interior of the frames or may pass inward. In order to protect themovable parts of the bore-machine against soiling, the border of the bearing-ring 8 leaves an annular clearance, and the said ring closes up the actual bore-space by a disc 91 and is provided with a sufficiently broad strip of bristles'92, which effects a sufficient packing of the top part of the bore-machine with respect to the swarf-water hurled into the well.

The clearance between the well and the boremachine has for its object to provide the well with a waterproof cementor asphalt lining, if necessary in accordance with the progress of boring. I I

For attaining this object, a tank 93 carrying in its material-space 94 a mixture of sand and quick hardernng cement is let down into the well until the place is reached where the lining is to'be applied. An upwardly tapered coneshaped tank 95 is arranged in the central part of the cement-tank 93 and contains the water necessary for forming the mortar, and the sliding olfof the mixture of cement and sandis facilitated by the steep outside of the coneshapedtank. For the same object the sandcompartment between the two tanks is divided by roof-shaped guides 9611, which conduct the mixture to the discharge openings 96.

A sufficient number of discharge openings 96 is provided in the bottom of the downward tank 95, the pump 103, the distributor 104 and the mixing pipe 105. with the divided drum 100 and the motors are enclosed by a cylindrical cover 99, which is arched at the top and bottom ends and the outer diameter of which exactly corresponds to the ultimate inner diameter of the well. This cover 99 is formed of a material to which the'mortar does not adhere but from which the latter'readily slides off, such as for instance vulcanized rubher, artificial resin, wood soaked with oil and so forth, or the said cover iscoated with a suitable lubricant and further is as smooth as possible.

The mortar drops through the openings 106 of the mixing funnel 101 into a rapidly rotating drum 107, which is conically enlarged downwardly and provided with radially disposed intermediate and guide plates 108 for forcing by centrifugal force the heavy parts of the mortar,

e. g. the sandand cement particles, towards the periphery of the drumand thus out of the cementing nozzles 109, which bluntly terminate in the outer wall, onto the wall of the well, while The mixing funnel 105' openings 11-1 onto the bore-machine.

may be shapedv in such. a manner,- that their rearward side-face is drawn slightly inward and gradually vpasses towards'the cylinder-wall 113 of the'drum 107 (1090, Fig; 9).

The mortar-nozzles 109 andthe water-nozzles 109a or the water roses 1092) are arranged preferably alternately, in order to moisten the walls of the well for the purpose of a better adherence of the mortar. Also a number of mortar-nozzles 109 and 109?) may be superposed atan incline, so that during a revolution of the drum a number of strips of mortar are disposed parallel side by side, whereby during-one revolution of the'drum the axial movement can be increased to the totalof the width of the superposed mortar-nozzles. I The concrete, hurled out of the openings 109 at the periphery, rests on the walls of the well and thus forms a coherent dense mortar-cover in accordance with the slow descent of the whole arrangement, which is effected by. a regular winding 011 ot the, hoisting ropes 112 above ground. The hurling. drum 107 ,isenclosed by a drum 113, which is curved at the top and bottom, cylindrical andsrnooth in the middlepart only and which has the, same diameter as the scraping drum 99 and serves for scrapingsmooth the material discharged from the openings 109 ofthe hurling drum, thus acting like a bricklayers trowel. V 7 Through the axis of the whole arrangement passes a pipe 114, which serves for the reception of the supporting rope 62 0f the bore-machine and as carrierot the parts of "the device, which maybe termed well-lining device, among the same-also the bearings 115 of the hurling drum 107 and their driving 'means, for instance motors 117 and gears 118.

. A circular disc with prim 119 in which a tire 120 with vrubberor leather-band 120afis inserted, the outside of which is closely fitted with bristles 121, closes up the bottom .of the arrangement, ,chiefiy. for preventing parts of the mortar and ;water from droppingthrough the The tire can be inflated by compressed air or,as shown by way of exampleinFig. 8,.by a pump 122.

Inthe inflated condition, the the 120 or its bristle rim 121 acts .not only as'protection against any mortar which may have dropped off, but also as meansfor centering the device, while the band 121a rests closely on the wall of the well and deflects dropping mortar towards the interior oi the disc 119, which for the-reception of larger quantities of mortar may be deepened like a boiler. 3

"The devices for operating the hurling drum 107, the divided drum 100 and the water supply- 7 103' can be adjusted by known means with respect to one another in such a manner, that the material: and watersupply agree with the consu'mptior. of mortar and, therefore they can be driven preferably by one motor.

The present process or the described machines operate in the following manner:-v

The: boring machine, Fig. 2, islet down practically to the ground of thewell by means of the supporting rope 62 and subsequently the clamping devices are electrically operated, and the same electric power starts the motors 4 and 14 of the system of chisels. The rapidly rota ing chisels 3, which are slightly inclined in the direction of the transverse movement subject the-rock to an action similar to milling owing tothe slower transverse feediand thestill slower axial feed; of the tools,.' so; that the swarf is in the shape of fine sand only. A good scavenging is effected by the nozzles 11 and 12, which are disposed opposite one another in a plane which is at a right angle to the plane of rotation of the chisels, in order to partly cool the hisels and partly carry off the bore-swarf.

The water, required for this scavenging, is sucked'in from the outer swarf-vessel 30 by means of the pump 28 and is forced with great speed into the pressure-pipe 11 and into the injector-cup 25 by way of the immovable pressure-pipe. 27 and the pressure-pipe 26, which slowly rotates with the machine. The pressurewater,- discharged with great speed from the nozzleof the pressure-scavenging pipe 11, hurls the scavenging water with the bore-swarf con tained in the same into the opposite nozzle of the suction-scavenging pipe 12, into which it is also drawn by the action of the injector and through the swarf-ascending pipe 26 over its bell-shaped member 55 into the filtering compartment 56 of the swarf-vessel 31, where the water trickles back through the filter into the space 30, while the swarf accumulates in the filter.

In view of the boring action and advance of the chisels, the boring machine with .its frame 8, suspended irom the toothed wheels 39', descends along the racks 33, while the other frames 35 and 47 are clamped to the wall of the well and thus do not move. Whenever the boring machine reaches the bottom end of the racks 33', the clamping devices of the frames 8, 35 and 47, are successively disengaged by the control rods 43 or 49 in such a manner, that at first the frame 8 carrying the boring mechanism is clamped and subsequently the rack-frame 35 is released, so that it can slide down, because it is practically not obstructed by the locking gear rotating vfreely in the reversed direction, until the suspension wheels 39 have reached the top endofthe rack and thus reverses the clamping devices in the way that now the feed-ring 35 is arrested again. Now the bearing-ring 8 is released again and finally the irame 47, carrying the swarf-vessel, is removed from the wall of the well, so that together with the swarf-vessel it can slowly follow the movement against the pressure of the damping piston 65 until the control 49 is again placed in the locking position by the extension 51. The swarf-vessel 31 with its supporting frame 47 descend in view of their Weight which is not balanced like the supportcharge of the swarf-vessel 31 is noticeable on a measuring device arranged on the balanced part of the supporting rope above ground. Whenever the swarf-vessel 31 is filled, the feed-tank is let down and its suction-cup 80 is guided through the adjusting roof 66 of the sWarf-vessel into the latter until the disk 70 of the catching device of the feedetank strikes the disc 61 of. the rope-head 60 and thus arrest in position the feed-tank and operates its double-pump 77. In view of the considerable movement of water in the vicinity of the suction-cap 80, which is caused bythe pressure water passing out of the pressure-tube 81, the swarf is distributed in the scavenging water in such a manner, that the swari-water formed thereby can be readily sucked through the suction-pipe 78, 79 and passed into the feed-tank in which the swarf is held back by its filter, while the water can return into the'water-tank 83 through the filter.

126 for guiding the machine. mounted. with its slide-rod or screw 124 in a pipe-rim 12'7, which is suspended irom a verti- "cs1 pin 132 by means of eyes128,pendulum-rods Whenever the feed-tankis charged with the contents of the swarf-vessel it can be lifted and emptied above ground in the same way or through a valve 88 whereby the swarf is violentlywashed, or the capacity of the feed-tank may be a multiple of the capacity of the swarftank 31 and it may operateintermittently and remain in the ground until it is fully charged. The latter method is resorted to in the event of very deep wells in order to reduce theconsiderable lifting operation. In this case the capacity of the swarf-tank 31 has to be such, that the latter holds the cut-off material during the to and fro movement of the feed-device.

If it is necessary to provide the wall of the well with a lining in view of the insufiicient strength of the bored layer, the swarf-feed is suspended above ground and is replaced by the well-lining device and sunk into the ground together with the necessary supply of sand mixed with quickly binding cement and with the necessary quantity of water. Whenever the place of building is reached, the packing-tires 120 consisting of one or more annular members are inflated and subsequently the divided wheels 100 of the water-motor 103 and the hurling drum 107 are operated. At the same time the device descends with a uniform speed in accordance with'the material treated in a unit of time, so that the motor hurled out of the nozzles 109 is applied'to the wall of the'well in the shape of a close spiral-tape and at the same time is smoothed by the rotating outer jacket 113 of the hurling drum. During the descent of the whole arrangement the hardening mortar-layer is further smoothed by the .very long drum-jacket 99'of the middle part. 'The rotary moment, which arises in view of the friction of thelrotating drum 113 at the place where the layer of sand and concrete has been just hurled out and which tends to turn the arrangement, is relievedby the considerbly greater fric tion of the strips of bristles 120, pressed onto the wall of the well.

If suitably constructed the present invention 'can be used also in connection with horizontal boring, for instance for constructing galleries, channels and tunnels as shown in Figures 11 to 15. v

. The same boring process is applicable also for the extraction of coals, salts, rocks or ores from mines, as illustrated in .Figs. 11 to 15.

For this object the rotating system of chisels with shaft 1, chisel-carriers 2 and chisels 3 rests on a fork 5 and is operated by motors 4, which however are disposed as close as possible to the place of suspension 127 of the fork-support in order to reduce as much as possible the moment of the centre of gravity at this place.

.As shown in Fig. 15 in some cases'it is possible andon the, end of which orfion which is slidable a balancing weight 153 and a hand-wheel The same is 129, 130 and a hinge 131, said pin resting in the top bracket 133 of a stand consisting of telescoping pipes 134 and .135, while its bottom bracket 136 is provided with a screw-shaft 138 and crank or hand-wheel 139 and foot-catch 140 for attachment in the gallery. The top bracket 133 carries the other catch 141.

In order to protect the workman against any material knocked off by the chisels, the fork 5 is provided with a protecting shield 142, which is provided with an opening 143 for permitting the cooling of the chisel by pressure-water supplied by Way of a tube 144 anda nozzle'145.

The stand is forninstance extensible by means of wedges 146 and wedge-slots 147 provided in both pipes. Also the suspension pendulum is divided into two pendulum rods 129 and 130, which are provided with holes 148 andconnected by bolts 1 19. The pendulum parallelogram shown in Figs. 11, 12 and 13 may be of course replaced by any other construction, which permits a ready and adjustable suspension, such as shown in Fig. 14, by means of two hinge-brackets 150 and a screw-shaft 152 connecting the latter to be operated in opposite direction by a hand-wheel 151 or by any other known means.

ner:-The chisel-machineper se treats in; thedirection of its plane of rotation only a face or" the width or" the chisels 3. In view of the movement of the rods 124, 125 or of the pendulum 129, 13001 150, 152 which is movable in all directions, the chisels can-be turned in all directions and as desired can berotated by means of the hand-wheel126, so that galleries aswell as narrow seams can be worked out, as diagrammatically illustrated in Fig. 15 by the different positions 154, 155 and the heightof the guide-rods, while the circular, path 156 in Fig. 13 indicates the movement in the horizontal direction.

The present principle. of circulating rockdressing membersfwhich' operate in two planes vertically disposed to one another, is not limited to the use of hurled annular chisels but ing the rock vertically or at an angle as shown .in' Figs. 16 and 17. For instance a single row it is also applicable to the use of chisels strik- 3 and 158. This ring of chisels rotates in one plane and is driven by motors 161,-which are arranged in an inner ring 157 or at both sides and as above are carried by a fork 5, to which is attached the other mechanism already described. As already mentioned the system of chisels may. be'rotated in its plane alsobya toothing 162, which isseeured to the fixed annular disc. 8 and rotated by a gear-163, 164:,

which is protected by a casing 165 against the penetration of swarf-water. Finally the rotations and their feed may be eifected by any inclined position 166 of thechisels with respect B to the radiior by the tangential return shock component of the chisels.

1 claim:- i J a l. Rock-boringmachine comprising in combination a circular carrier, clamping 'means on said carrier for securing'it in the well, a vertical bearing arranged in said carrier, a forked member mounted freely movable in said bearing, a system of chisels mounted rotatable in avvertical plane in said forked member, means mounted on said forked member for rotating said system of 'chisels, a pressure pipe secured to said rotating forked member, .a suction pipe also secured to the latter, the outlet of said pressure pipe facing the inlet of said suction pipe and both pipes, being located at a right angle to the rotating system of chisels,

ZrROc'k-boring' machine comprising in combination a circular carrier, clamping means on said carrier for securing it in the well, a vertical bearing arrangedin said carrier, a forked member mounted freely movable insaid bearing,

a system of chisels mounted rotatable in a vertical plane in said forked member, means mounted on saidfor kedmem'ber for rotatingsaid system of chisels, a pressure pipe secured to said rotating forked member, a suction pipe also secured to the latter the outlet ofsaid pressure (pipe facing the inlet of said suction pipe and both .pipes beingi-located' at a right angle to the rotating system of chisels, a drum ee-cured =in said-bearing, an axial main-tube extending frornsaid drum, the inlet end of said pressure pipe and the outlet end of said suction pipe terminating Y mounted on the latter, clamping means on said irame for fixing the --latter in the well, a -mechanism secured to "Said. frame for feeding the i [on the yessel filled with clean 7 which .the other end of said short pipe is se- "car-rier with the rotating system of chisels.

3. Rock-boring -machi-ne comprising in comf-bination a circula-rcarrier, clamping means on said carrier for securing it in the Well, a vertic-albearing arranged ingsaid carrier, a forked member mounted freely movable in said bearing, -a system 0f 'chisels mounted" rotatable in a -vert-ical "plane in said forked member, means mounted on said "forked member for rotating said system1-of chisels a pressure pipe securedto said rotating forked member, asuction pipe also secured to the latter, the outlet of said pressure pipedacing the inletfof said suction pipe and bothpipes being located at arig'ht angle to the rotating system of chisels, a drum secured in said bearing, an axial main-tube extending from said drum, the inlet end of said pressure pipe and the outlet end of said suction pipe terminating in said tube, a frame slidablymounted on the latter, clamping means on said frame for fixing the latter in the Well, a mechanism secured to said. frame for feeding the carrier 'with the rotating system of chisels, a second frame slidably mounted on said tube, clamping means on-said second framefor fixing in the well, a mechanism secured toboth frames for feeding the second frame, a double-walled vesselfor the reception of clean water and swarf slidably mounted on tube and secured to said second, frame, a short pipe, one end of the latter extending into cured, {a bentlpipe secured to said pump and extending into said main-tube, a pressure pipe centrally fixed in said main-tube, the end of #said tube, a -frame slidably water, a pump to said bent pipe extending "tightly although slidingly'into the end of said central tube, the other or bottom end of said central tube facing the inlet end of the pressure pipe first mentioned and is turned back and in the shape of a cone, the end of the pressure pipe is flared and surrounds, said 'conev with a clearance to form an injector.

4. Rock-boring machine comprising in combination a circular carrier, clamping means on said carrier for securing it in the Well, a vertical bearing arranged in said carrier, a forked member mounted freely movable in said bearing, a system of chisels mounted rotatable in a vertical plane in said forked member, means mounted on said forked member for rotating said system of chisels, a pressure pipe secured to said rotating forked member, a suction pipe also secured to the latter, the outlet of said pressure pipe facing the inlet of saidsuction pipe and both pipes being located at a right angle to the rotating System of chisels, a drum secured in said bearing, an axial main-tube extending from said drum, the inlet end-of said pressure pipe and the outlet end of said suction pipe terminating in said tube, a frame slidably mounted on the lattenclainping means on said frame for fixing -t'hela'tter thewell, a mechanism secured to said frame, for feeding the, carrier with the rotating system of chisels, .a second frame slidably mounted on said tube, clamping means on said second frame for fixing in the Well, a mechansecured to 'both'irames for feeding the second frame, a double-walled vessel for the reception of clean Water and swarf ;,slidab1y mounted on said tube and secured to said second 'i'rame, a short'pipe, one end of the 'latter extending into 'thevessel filled withclean water, a pump to. which the other end of said short pipe is secured, a bent pipe'secured to said pump and extending into said main-tube, a pressure pipe centrally fixed in said Imain-tube, the end of said bent pipe extending tightly although .slidingly into the end of said central tube, the other or bottom end of said central tube facing the inlet end ofthe pressure pipe first mentioned and is turned back and in'the shape of a'cone, the end of the pressure pipe is flared and surrounds said cone with a clearance to forman injector, a curved cover secured to said vessel, a rope fixed to said cover, a second double-walled vessel for clean water and swarf slidabiy mounted on said rope, means attached to said second .vessel for separately hoisting the latter, a pressure .pipe and a suction ,pipe passing through the second vessel, a suction basket in which one end of each of the pipes last mentioned terminates, asecond pump on the second vessel, theother end of said pipes last mentioned terminating in said second pump, a swarf-pipe extending from the latter into the inner p'artof said second vessel, a suction pipe establishing communication between said second pumpfand-the water-compartment ofjsaid second vessel acting as hoisting box, and clamping means'secured to the lattm.

"5. Rock-boringima'chine as claimed in claim 3 further comprising a screen arranged in and forming the partition of .said double-walledvessel, for thepurpose specified.

dRock-boring 'machineyas claimed in claim f3ffurther comprising an intermediate support between said carrier and the first frame, a-gear secured'to the 'latter'and thecarrier, said gear operating in accordance with the boring feed of the system of chisels, a stop on the gear, means secured to said intermediate frame co-operating with said stop, disengaging means on the first frame, for the purpose specified.

7. Rock-boring machine as claimed in claim 3 further comprising an intermediate support between said carrier and the first frame, a gear secured to the latter and the carrier, said gear operating in accordance with the boring feed of the system of chisels, a stop on the gear, means secured to said intermediate frame co-operating with said stop, disengaging means on the first frame, a disengaging member secured to the first frame, a pawl on the second frame cooperating with said disengaging member, and braking means on the first frame, for the purpose specified.

8. Rock-boring machine as claimed in claim 3 further comprising an intermediate support between said carrier and the first frame,- a gear secured to the latter and the carrier, said gear operating in accordance with the boring feed of the system of chisels, a stop on the gear, means secured to said intermediate frame cooperating with said stop, disengagingv means on the first frame, a disengaging member secured to the-first frame, a pawl on the second frame cooperating with said disengaging member, a double walled hydraulic cylinder on the first frame, a piston working in the inner cylinder, the piston-rod of said piston being fixed to said second frame, a hole in the top of the inner cylinder, a valve on said top of cylinder, a small hole in said valve, and small bores near the upper end of said inner cylinder establishing communication with the outer cylinder, for the purpose 9. Rock-boring machine as claimed in claim 1, further comprising bristles on the outside wall of said carrier. c

l0. Rock-boring machine as claimed in claim 4, further comprising a bridging member on said first double-walled vessel, and a steep curved guiding roof over said bridging member, for thepurpose specified.

11. Rock-boring machine as claimed in claim 4, further comprising ropes attached to the ma- "chine for carrying the same, a' current supply cable enclosed in said ropes, a sleeve for holding together the ropes and cables near to bottom end, a tensioning bracket mounted on the ropes, and a plate on said sleeve, for the purpose specified. I

12. Rock-boring machine as claimed in claim 3, further comprising a central pipe around the hoisting rope, for the purpose specified.

l3. Rock-boring machine as claimed in claim 4, further comprising a valve in the floor of the outer vessel of said second double walled vessel for discharging the clean water into the first double-walled vessel.

14. Rock-boring machine as claimed in claim 4, further comprising a screen arranged in and forming the partition of said second doublewalled vessel, for the purpose specified.

15. Rock-boring machine as claimed in claim 4, further comprising ropes attached to the ma chine for carrying the same, a current supply cable enclosed in said ropes, a sleeve for holding together the ropes and cables near to bottom end, a tensioning bracket mounted on the ropes,

secured to the other side of said bracket but electrically insulated from the latter.

17. Roclr-boring machine comprising in combination a central tube, a system of chisels secured to said tube and rotating in a horizontal plane and having an operating outer diameter slightly larger than the diameter of the lined well, centering rings above said system of chisels, a disk-wheel secured to said tube above the system of chisels, and a packing ring on said wheel, for the purpose specified.

l8. Rock-boring machine comprising in combination a carrier, clamping means on said carrier for fixing it in position in the tunnel, an extensible pendulum secured to said carrier and rotatable about a vertical axis and movable about a horizontal axis, a bearing secured to said pendulum and movable about a horizontal axis, a shaft passing through said bearing, a fork secured to said shaft, a system of chisels rotatably mounted in said fork, motors arranged on the latter, means for transmitting the action of the motors to the rotating chisels, a second shaft slidingly passing into the shaft first mentioned, means for fixing the second shaft in the desired position in the first shaft, and a hand wheel with a balancing weight secured to the second shaft, for the purpose specified.

l9. Rock-boring machine as claimed in claim 18, further comprising a protecting cover arranged on the fork, and a flexible pipe passing through said cover into the plane of the rotating chisels, for the purpose specified.

20. Rock-boring machine as claimed in claim 18 in which the first shaft and its bearing are screw-threaded.

21. Rock-boring machine as claimed in claim 1 in which the system of rotating beating chisels is in the shape of a rotating system of radially I vibrating chisels.

22. Rock-boring machine as claimed in claim 1 in which the system of rotating beating chisels is in the shape of a rotating system of vibrating chisels operating in the plane of rotation and at an incline to a tangent of the periphery of the path of rotation of the chisels, for the purpose specified.

LUDWIG HAMMER. 

